Question

Give the decreasing order of hyperconjugative effect of `R` in `R - CH = CH_2`, where `R` is :
(I) `Me-`
(II) `Et-`
(III) `Me_2CH-`
(IV) `Me_3C-`.
A. `I gt II gt III gt IV`
B. `IV gt III gt II gt I`
C. `II gt I gt III gt IV`
D. `IV gt III gt I gt II`

Answer 1

Correct Answer - A
(a) In `Me -(3 alpha-H) gt CH_3-CH_2 - (2 alpha - H)` `(1 alpha - H) Me_3 C-(no alpha - H)`.